Add the ability to add Foreign Key via attribute

[msmakouz]

• Add the ability to configure foreign keys schema-builder#67

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (42ab4a2) 91.35% compared to head (b4fa5c0) 91.36%.

Files	Patch %	Lines
src/Configurator.php	78.12%	7 Missing ⚠️
src/Entities.php	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                3.x      #91   +/-   ##
=========================================
  Coverage     91.35%   91.36%           
- Complexity      269      285   +16     
=========================================
  Files            32       33    +1     
  Lines           694      741   +47     
=========================================
+ Hits            634      677   +43     
- Misses           60       64    +4     

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